The Grote Kerk was built between 1470–1498 by Anthonius Keldermans. It is dedicated to St Lawrence contains the tomb of Floris V, Count of Holland (d. 1296), a brass of 1546, and some paintings (1507). The mechanical clock has 27 bells by Melchior de Haze (1600s), and 8 modern bells. The tower bell was made by Jan Moer in 1525, with a diameter or 130 cm.
The two organs are world-famous. The smaller one, called the 'Koororgel', was built in 1511 by Jan van Covelens, and is built against the North wall of the church. It is the oldest playable organ in the Netherlands. The larger organ at the west end of the church is one of the most famous, significant and beautiful organs in the world. It was built by Jacobus Caltus van Hagerbeer, finished in 1645. The magnificent casework, which unusually stretches from floor to vault and makes the organ part of the architecture of the church, was designed by Jacob van Campen, a leading architect of the time. The enormous canvas shutters were painted by Caesar van Everdingen.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.